Also report navigation policy for createView if requested

Also report navigation policy for createView if requested

If a link has target=_blank we don't navigate to it, but create a new tab,
and then navigate to it. To be able to write a layout test for the policy used to create the new tab, I need to dump it here too

BUG=454222
R=mkwst@chromium.org

Committed: https://crrev.com/cfb07325e71784d1825923f8fef79c9ca52e61d9
Cr-Commit-Position: refs/heads/master@{#330307}

[Mike West, 2015-05-17 13:14:02]

LGTM.

Are there web-visible impacts of the policy? Like, won't `window.opener` be set
in such a way that you could read the `window.name` or something?

[jochen (gone - plz use gerrit), 2015-05-17 13:15:40]

unless it's something like ignore or download, no, it's not web-visible (also
not visible in content shell to the user...)

[jochen (gone - plz use gerrit), 2015-05-17 13:15:46]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2015-05-17 13:15:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1129203005/1

[commit-bot: I haz the power, 2015-05-17 13:30:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-18 11:32:44]

Patchset 1 (id:??) landed as
https://crrev.com/cfb07325e71784d1825923f8fef79c9ca52e61d9
Cr-Commit-Position: refs/heads/master@{#330307}